A satellite calibration LED light source device

Abstract

The present invention discloses an on-star calibration LED light source device, comprising a chassis, a control device, and an LED device; the control device and the LED device are installed in the chassis, the control device comprises a constant current control device and a temperature control device; the constant current control device provides a constant driving current for the LED device, and the temperature control device provides a constant operating temperature for the LED device, the LED device comprises a circuit board, a light source, a light source focusing device, and a light source impurity removal device, the circuit board is electrically connected to the light source, the light source is focused by the light source focusing device, and then the light source impurity removal device is used to eliminate stray light. The present invention has the advantages of simple structure, small size, and light weight.

Description

Technical Field

[0001] The invention belongs to the field of light source calibration of aerospace space remote sensing instruments, and in particular relates to an on-board calibration LED light source device. Background Art

[0002] Since the on-board light source in space remote sensing instruments has high stability requirements and the stability may decrease after long-term operation, the on-board light source calibration is the most important part of the radiation calibration system of space remote sensing instruments. The accuracy of on-board calibration affects the stability and working accuracy of space remote sensing instruments to a certain extent.

[0003] The calibration light source is the most important part of the radiation calibration system. A good calibration light source should be stable, have rich adjustable levels, wide spectral range, simple structure and easy to control. Spectral radiometer, standard lamp, integrating sphere, standard reflectance whiteboard are the basic components of the traditional calibration light source. This traditional calibration light source controls the radiance output by the integrating sphere by lighting up different numbers of standard lamps in the integrating sphere. Although traditional light sources have the advantages of stability and wide spectral range, they also have some insurmountable disadvantages, such as few adjustable levels, complex structure, large space occupation, complex control methods, etc. In order to solve the shortcomings of traditional calibration light sources, finding new calibration light sources has become an important part of radiation calibration research. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide an on-board calibration LED light source device in view of the deficiencies in the prior art. The present invention is a new type of calibration and detection light source device that uses LED as a light-emitting device for calibration. The light source device has the advantages of high precision, small size and light weight.

[0005] The technical solution for realizing the present invention is:

[0006] The present invention discloses an on-board calibration LED light source device, comprising a chassis, a control device, and an LED device; the control device and the LED device are installed in the chassis, the control device comprises a constant current control device and a temperature control device; the constant current control device provides a constant driving current for the LED device, and the temperature control device provides a constant operating temperature for the LED device; the LED device comprises a circuit board, a light source, a light source focusing device, and a light source impurity removal device; the circuit board is electrically connected to the light source, the light source is focused by the light source focusing device, and then the light source impurity removal device is used to eliminate stray light.

[0007] Preferably, the constant current control device includes a linear voltage stabilizer and a low temperature drift precision resistor R, the linear voltage stabilizer is electrically connected to the resistor R, the linear voltage stabilizer is installed in the chassis through a mounting plate, and the linear voltage stabilizer is electrically connected to the circuit board; the temperature control device includes a thin film heater, a MOS tube and a thermistor; the heating of the thin film heater is controlled by the MOS tube, and heats the LED device, the MOS tube and the thermistor are both electrically connected to the circuit board, the circuit board collects the temperature of the LED device through the thermistor, controls the opening and closing of the MOS tube according to the temperature, and controls the heating of the thin film heater by the opening and closing of the MOS tube.

[0008] Preferably, the chassis is a box structure, the control device is located in the rear part of the chassis, a chassis rear cover is provided at the end of the rear part of the chassis, a mounting plate is provided on the inner side of the chassis rear cover, and the linear voltage regulator and the MOS tube are both mounted on the mounting plate; the LED device is located in the front part of the chassis, a chassis front cover is provided at the end of the front part of the chassis; a boss is provided on the middle inner wall of the chassis, the circuit board is mounted on the boss, a light source bracket is installed in the chassis on the front side of the circuit board, the light source is mounted on the light source bracket, the film heater is pasted on the light source bracket, and the light source is evenly distributed with thermistors.

[0009] Preferably, the mounting hole on the linear voltage regulator is mounted on the mounting board through a first insulating column, and the mounting hole on the MOS tube is mounted on the mounting board through a second insulating column.

[0010] Preferably, the first insulating column and the second insulating column are both made of polyimide insulating columns. The use of the first insulating column can enable the linear voltage regulator to be installed on the mounting board insulatedly, and the use of the second insulating column can enable the MOS tube to be installed on the mounting board insulatedly.

[0011] Preferably, a second gasket is provided between the light source bracket and the inner wall of the chassis, and a first gasket for heat conduction and heat dissipation is provided between the light source and the light source bracket; the second gasket is a polyimide gasket, and the first gasket is a white thermally conductive and heat-dissipating silicone gasket. The second gasket can insulate the light source bracket from being installed between the chassis, and the first gasket can make the heat diffusion between the light source bracket and the light source more even.

[0012] Preferably, the light source adopts four groups of LED chips with different spectra, the light source focusing device adopts four convex lenses, the light source impurity removal device adopts a front cover plate of the chassis, the four groups of LED chips are arranged in a square, each of the LED chips is facing a convex lens, the convex lens is installed on the inner side of the front cover plate of the chassis through a lens cover plate, and a light source impurity removal device is provided on the front cover plate of the chassis facing the convex lens, the inner wall of the light source impurity removal device adopts matte thread and black anodized surface; the light source impurity removal device can eliminate stray light of the light source and eliminate large-angle emitted light.

[0013] Preferably, the four groups of different spectra of the LED chip respectively use a white light source with a wavelength of 0.400um-0.780um, a blue light source with a central wavelength of 0.420um, and a near-infrared monochromatic light source with two central wavelengths of 0.750um and 0.870um, and all light sources are connected in series; these four groups of light sources have a wide spectral coverage range and can cover the visible and near-infrared bands. These four groups of light sources have the advantages of high spectral and intensity stability.

[0014] Preferably, the linear voltage regulator device adopts a linear voltage regulator of model LM117, which is applicable to a wider range of operating temperatures and is easy to use.

[0015] Preferably, the chassis is provided with an electrical connector, which serves as a power supply interface for the entire device.

[0016] The working process of the present invention is as follows: the present invention uses a constant current control device to drive the LED device with a constant current. According to the constant current precision control requirement for the light source power supply in the LED device, a linear voltage stabilizer is used for constant current driving. By adjusting the resistance value of the low temperature drift precision resistor R, the driving current of the LED device is regulated. The temperature control device controls the LED device with a constant working temperature. Considering the working temperature range and the temperature control precision requirement of the LED device comprehensively, the present invention performs single-end heating temperature control on the working temperature of the LED device through the cooperation of a thin film heater, a MOS tube and a thermistor, and sets the temperature control point of the active temperature control to T. 0 ±0.5℃, that is, higher than T 0 +0.5℃ temperature control heating is turned off, below T 0 The temperature control heating starts at -0.5℃; the temperature control device uses a thin film heater as an actuator to heat the LED device. The control module of the circuit board on the LED device collects the target temperature through the thermistor. When the temperature is lower than the lower limit of the target temperature T 0 When the temperature reaches -0.5℃, the control module outputs the heating start signal, the heating MOS tube turns on, and the film heater starts heating to reach the target temperature T 0 After +0.5℃, the control module outputs a heating off signal, the heating MOS tube is turned off, and the film heater stops heating. After the film heater stops working, the LED device is affected by the ambient temperature and the temperature drops to as low as T 0 When the temperature is -0.5℃, the temperature control device repeats the above operation.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects:

[0018] (1) The present invention arranges a constant current control device and a temperature control device in a chassis to provide a constant current drive and a constant operating temperature control for the LED device. The constant current drive is used to fine-tune the light source, thereby achieving the constant current precision control requirement for the light source power supply in the LED device and greatly improving the accuracy of calibration detection.

[0019] (2) The present invention uses active temperature control on the light source to control its working junction temperature to remain consistent under different working conditions, thereby ensuring the light energy output intensity and spectral stability requirements of the light source within the entire working temperature range; it has the advantages of high precision, simple structure, small size and light weight, and is very suitable for use as a built-in calibration light source to perform real-time relative radiation calibration on space remote sensing instruments.

[0020] (3) When the temperature of the light-emitting device LED device in the present invention is constant, the luminous intensity is approximately linearly related to the current passing through it. Therefore, it is particularly suitable for fine-tuning the light emitted, thereby greatly improving the accuracy of calibration detection. It has the advantages of many controllable levels, simple structure, and small size, and has good application prospects in optical detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 It is a structural schematic diagram of the LED light source device of the present invention;

[0023] Figure 2 is a cross-sectional view of the LED light source device of the present invention;

[0024] Figure 3 It is a schematic diagram of an exploded view of the LED light source device of the present invention.

[0025] In the figure, 1-chassis, 11-chassis front cover, 12-chassis rear cover, 2-linear voltage regulator, 21-mounting plate, 22-first insulating column, 3-thin film heater, 4-MOS tube, 41-second insulating column, 5-thermistor, 6-light source, 61-first gasket, 62-circuit board, 7-light source bracket, 71-second gasket, 8-convex lens, 81-lens cover, 9-electrical connector. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0027] Embodiment: A satellite calibration LED light source device comprises a chassis 1, a control device, and an LED device; the control device and the LED device are installed in the chassis 1, the control device comprises a constant current control device and a temperature control device; the constant current control device provides a constant driving current for the LED device, the constant current control device comprises a linear voltage regulator 2 and a low temperature drift precision resistor R, the linear voltage regulator 2 and the resistor R are electrically connected, according to the constant current precision control requirement for the light source power supply in the LED device, the linear voltage regulator 2 drives the LED device with a constant current, and adjusts the driving current of the LED device by adjusting the resistance value of the low temperature drift precision resistor R, wherein the linear voltage regulator 2 preferably adopts a linear voltage regulator of model LM117, which can be applied to a wider range of operating temperatures and is simple to use; the temperature control device controls the LED device with a constant current. The light source in the ED device provides a constant working temperature. The linear voltage stabilizer 2 is installed in the chassis 1 through the mounting plate 21, and the linear voltage stabilizer 2 is electrically connected to the circuit board 62; the temperature control device includes a film heater 3, a MOS tube 4 and a thermistor 5; the heating of the film heater 3 is controlled by the MOS tube 4, and heats the LED device. The MOS tube 4 and the thermistor 5 are both electrically connected to the circuit board 62. The circuit board 62 collects the temperature of the LED device through the thermistor 5, controls the opening and closing of the MOS tube 4 according to the temperature, and controls the heating of the film heater 3 through the opening and closing of the MOS tube 4; the LED device includes a circuit board 62, a light source 6, a light source focusing device and a light source impurity removal device. The circuit board 62 is electrically connected to the light source 6, the light source 6 is focused by the light source 6 focusing device, and then the light source is eliminated by the light source impurity removal device.

[0028] As attached Figures 1 to 3 As shown, the chassis 1 is a box structure, and the box structure is divided into a front part and a rear part, wherein the control device is preferably installed in the rear part of the chassis 1, and a chassis rear cover plate 12 is provided at the end opening of the rear part of the chassis 1, and the LED device is located in the front part of the chassis 1, and a chassis front cover plate 11 is provided at the end opening of the front part of the chassis 1; there is a 6mm thickness margin between the front part and the rear part, the front part is connected to the chassis front cover plate 11 through 4 M3×8mm screws, and the rear part is connected to the chassis rear cover plate 12 through 4 M3×8mm screws, and an electrical connector 9 is installed on the chassis 1, and the electrical connector 9 is used as the power supply interface. The electrical connector 9 is divided into J63A-222-009-261TH and J63A-212-009-161JC1, and the two are connected by 2 M1.6×8mm screws; after the above connection, the overall assembly appearance of the light source device is formed.

[0029] The machined front part of the chassis 1 is used to install the light source 6, the light source focusing device and the light source impurity removal device; the light source 6 adopts four groups of LED chips with different spectra, and the four groups of different spectra of the LED chips respectively adopt a white light source with a wavelength of 0.400um-0.780um, a blue light source with a central wavelength of 0.420um and a near-infrared monochromatic light source with two central wavelengths of 0.750um and 0.870um, and all light sources 6 are connected in series; these four groups of light sources have a wide spectral coverage range and can cover the visible and near-infrared bands. These four groups of light sources have the advantages of high spectral and intensity stability. The light source focusing device adopts four convex lenses 8, and the light source impurity removal device adopts the front of the chassis Cover plate 11, four groups of LED chips are arranged in a square, and each LED chip is facing the convex lens 8. In order to improve the utilization rate of the light energy of the light source and the subsequent requirement of eliminating stray light, a convex lens is added to the light source for focusing. The four convex lenses corresponding to the four light sources are of the same size and are installed in a modular manner. The convex lens 8 is installed on the inner side of the front cover plate 11 of the chassis through the lens cover plate 81 and 4 M2×6mm screws. The front cover plate 11 of the chassis is equipped with a light source impurity removal device facing the convex lens 8. The inner wall of the light source impurity removal device adopts matte thread and black anodized surface to eliminate large-angle emitted light; the light source 6 is installed on the light source bracket 7 The light source bracket 7 is installed inside the chassis. A second gasket 71 is provided between the light source bracket 7 and the inner wall of the chassis. The second gasket 71 is used for heat-insulating installation of the light source bracket and the chassis 1. A first gasket 61 for heat conduction and heat dissipation is provided between the light source 6 and the light source bracket 7. The first gasket 61 is used for heat conduction installation of the light source and the light source bracket. The first gasket 61 adopts a white heat-conducting and heat-dissipating silicone gasket, and the second gasket 71 adopts a polyimide gasket. A thin film heater 3 is attached to the light source bracket 7, and a thermistor 5 is attached to the left and right of the light source. The rear part of the chassis 1 machined is used to install a circuit board 62, a linear voltage regulator 2, and a MOS tube 4; the circuit board 62 is on the inner wall of the rear part of the chassis 1 A boss is provided, and the circuit board 62 is installed on the boss by means of 4 M2×6mm screws. The mounting hole on the linear voltage regulator 2 is installed on the mounting plate 21 of the linear voltage regulator 2 by means of 2 M3×12mm screws and 1 M3mm nut through the first insulating column 22. The mounting hole on the MOS tube 4 is installed on the mounting plate 21 of the linear voltage regulator 2 by means of 2 M2.5×10mm screws and 2 M2.5mm nuts through the second insulating column 41. The first insulating column 22 and the second insulating column 41 are both made of polyimide insulating columns. The first insulating column and the first insulating column are used for thermal insulation installation of the MOS tube, the linear voltage regulator 2 and the mounting plate of the linear voltage regulator 2.

[0030] Description of the main components in this embodiment:

[0031] The chassis rear cover 12, mounting plate 21, chassis 1, light source bracket 7, lens cover 81, and chassis front cover 11 are all 2A12 aluminum alloy machined parts; the linear voltage regulator 2 adopts TI (Texas Instruments) LM117; the MOS tube 4: adopts IR (International Rectifier Corporation); the electrical connector 9: adopts the electrical connectors of AVIC Optronics J63A-212-009-161JC1 and J63A-222-009-261TH; the model of the thin film heater is: 15V, 6.5W; the circuit board: the size of the circuit board is preferably a 40*40mm circuit board, which is manufactured using a dry film process and military-grade A material with a watermark. The average thickness of the copper surface of the circuit board is 30um, the average thickness of the copper hole is 18um, the ink thickness is 10-15um, the paint thickness is 15um, and the immersion gold thickness is 0.8-1.2uinch. It is inspected and qualified according to the international IPC inspection standards. The electrical performance is fully tested by optical AIO; Light source 6: CIOT-LED-M type LED light source component developed by Changzhou Institute of Optoelectronic Technology is selected. The component is mainly composed of four LED chips with different spectra, namely a white light (wavelength 0.400~0.780um) light source, a blue light (central wavelength 0.420um) and two near-infrared monochromatic light sources (central wavelengths: 0.750um and 0.870um respectively). The four groups of light sources are connected in series. The LED light source component refers to the "Upgrade Screening Conditions for High-power Semiconductor Lighting Devices" for 100% upgrade screening for quality assurance. The LED light source components upgraded with reference to the upgrade screening conditions have been successfully used in the rendezvous and docking lights and cabin lighting of many manned transport spacecraft and space laboratories in my country, as well as the light source systems of other space model missions; Convex lens 8: Made of quartz glass.

[0032] The working process of this embodiment is as follows: the present invention uses a constant current control device to drive the LED device with a constant current. According to the constant current precision control requirements for the light source power supply in the LED device, a linear voltage regulator 2 is used for constant current driving. By adjusting the resistance value of the low temperature drift precision resistor R, the driving current of the LED device is regulated. The temperature control device controls the LED device with a constant working temperature. Considering the working temperature range and temperature control precision requirements of the LED device, the present invention uses a thin film heater, a MOS tube and a thermistor to cooperate with each other to perform single-ended heating temperature control on the working temperature of the LED device, and sets the temperature control point of the active temperature control to T. 0 ±0.5℃, that is, higher than T 0 +0.5℃ temperature control heating is turned off, below T 0 The temperature control heating starts at -0.5℃; the temperature control device uses a thin film heater as an actuator to heat the LED device. The control module of the circuit board on the LED device collects the target temperature through the thermistor. When the temperature is lower than the lower limit of the target temperature T 0When the temperature reaches -0.5℃, the control module outputs the heating start signal, the heating MOS tube turns on, and the film heater starts heating to reach the target temperature T 0 After +0.5℃, the control module outputs a heating off signal, the heating MOS tube is turned off, and the film heater stops heating. After the film heater stops working, the LED device is affected by the ambient temperature and the temperature drops to as low as T 0 When the temperature is -0.5℃, the temperature control device repeats the above work. The present invention equips the LED device with constant current drive and constant working temperature control. Through constant current drive, the light source is fine-tuned, and the constant current precision control requirement of the light source power supply in the LED device is realized, which greatly improves the accuracy of calibration detection; by adopting active temperature control for the LED device of the light source, the working junction temperature under different working conditions is controlled to remain consistent, which meets the requirements of light energy output intensity and spectral stability of the light source in the full working temperature range; when the temperature of the light-emitting device LED device in the present invention is constant, the luminous intensity is approximately linearly related to the current passing through it, therefore, it is particularly suitable for fine-tuning the light source, thereby greatly improving the accuracy of calibration detection; it has the advantages of many controllable levels, simple structure and small size, and has good application prospects in optical detection.

[0033] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A satellite calibration LED light source device, characterized in that: It comprises a chassis, a control device, and an LED device; the control device and the LED device are installed in the chassis, the control device comprises a constant current control device and a temperature control device; the constant current control device provides a constant driving current for the LED device, and the temperature control device provides a constant operating temperature for the LED device; the LED device comprises a circuit board, a light source, a light source focusing device, and a light source impurity removal device; the circuit board is electrically connected to the light source, the light source is focused by the light source focusing device, and then the light source is impurity-removed by the light source impurity removal device; The constant current control device includes a linear voltage regulator and a low temperature drift precision resistor R, the linear voltage regulator is electrically connected to the resistor R, the linear voltage regulator is installed in the chassis through a mounting plate, and the linear voltage regulator is electrically connected to the circuit board; the temperature control device includes a film heater, a MOS tube and a thermistor; the heating of the film heater is controlled by the MOS tube, and the LED device is heated, the MOS tube and the thermistor are both electrically connected to the circuit board, the circuit board collects the temperature of the LED device through the thermistor, controls the opening and closing of the MOS tube according to the temperature, and controls the heating of the film heater through the opening and closing of the MOS tube; The chassis is a box structure, the control device is located in the rear part of the chassis, a chassis rear cover is provided at the end of the rear part of the chassis, a mounting plate is provided inside the chassis rear cover, and the linear voltage regulator and the MOS tube are both mounted on the mounting plate; the LED device is located in the front part of the chassis, a chassis front cover is provided at the end of the front part of the chassis; a boss is provided on the middle inner wall of the chassis, the circuit board is mounted on the boss, a light source bracket is installed in the chassis located in front of the circuit board, the light source is mounted on the light source bracket, the film heater is pasted on the light source bracket, and the light source is evenly distributed with thermistors.

2. The on-board calibration LED light source device according to claim 1, characterized in that: The mounting hole on the linear voltage regulator is mounted on the mounting plate through a first insulating column, and the mounting hole on the MOS tube is mounted on the mounting plate through a second insulating column.

3. The on-board calibration LED light source device according to claim 2, characterized in that: The first insulating column and the second insulating column are both made of polyimide insulating columns.

4. The on-board calibration LED light source device according to claim 1, characterized in that: A second gasket is provided between the light source bracket and the inner wall of the chassis, and a first gasket for heat conduction and heat dissipation is provided between the light source and the light source bracket; the second gasket is a polyimide gasket, and the first gasket is a white thermally conductive and heat-dissipating silicone gasket.

5. The on-board calibration LED light source device according to claim 1, characterized in that: The light source adopts four groups of LED chips with different spectra, the light source focusing device adopts four convex lenses, the light source impurity removal device adopts a front cover plate of the chassis, the four groups of LED chips are arranged in a square, each of the LED chips is facing a convex lens, and the convex lens is installed on the inner side of the front cover plate of the chassis through a lens cover plate, and a light source impurity removal device is provided on the front cover plate of the chassis facing the convex lens, and the inner wall of the light source impurity removal device adopts matte threads and a black anodized surface.

6. The on-board calibration LED light source device according to claim 5, characterized in that: The four different spectrums of the LED chip respectively use a white light source with a wavelength of 0.400um-0.780um, a blue light source with a central wavelength of 0.420um, and a near-infrared monochromatic light source with two central wavelengths of 0.750um and 0.870um, and all the light sources are connected in series.

7. The on-board calibration LED light source device according to claim 1, characterized in that: The linear voltage regulator device adopts a linear voltage regulator of model LM117.

8. The on-board calibration LED light source device according to claim 1, characterized in that: The chassis is provided with an electric connector.

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